Binance alpha rules have changed. It’s not about clicking to claim as soon as your score is high enough that guarantees you will get it.
Today, a member of the airdrop group reported that on three phones, the first two received an error message when clicked, but when they clicked on the third phone, they were able to claim it directly.
The key point is that the last phone clicked actually got it.
Binance may have set up a whitelist, and certain users may not be able to claim even if their score is sufficient; the system simply keeps displaying an error message.